First of all Kirito is actually still a guy he transferred his ALO account to gun gale online and got a rare character than most guys in the series who look bulky kirito's on the other hand is built for speed

Kirito is still playing with a male avatar. It explains why his appearence is like that within five minutes of being in GGO and is actually very important to the story. Also the two in your pic are some of the only females in that game.